Bob Rossi wrote, quoting Eric Blake:
>> So, if you INSIST on using the cygwin environment to cross-compile
>> mingw binaries, you should use:
>>
>> ./configure --build=i686-pc-cygwin --host=i686-pc-mingw32 \
>> CC='gcc -mno-cygwin' CXX='g++ -mno-cygwin'
>
> Well, if I do that, I get this:
>
> checking for MAP_ANON in sys/mman.h... no
> checking for /dev/zero... configure: error: cannot check for file
> existence when cross compiling
>
> This comes from the
> AC_CHECK_FILE(/dev/zero)
That's because AC_CHECK_FILE tests a feature of the *host*, not the
*build* environment. If you use AC_CHECK_FILE in your configure.ac,
(or if you insist, configure.in) then you *cannot* cross compile the
application. And, if you want to build MinGW apps under Cygwin, you
*must* be able to cross compile.
(RTFM: File: autoconf.info, Node: Files
|You might also need to check for the existence of files. Before using
|these macros, ask yourself whether a run-time test might not be a better
|solution. Be aware that, like most Autoconf macros, they test a feature
|of the host machine, and therefore, they die when cross-compiling.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
| - Macro: AC_CHECK_FILE (FILE, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
| Check whether file FILE exists on the native system. If it is
| found, execute ACTION-IF-FOUND, otherwise do ACTION-IF-NOT-FOUND,
| if given.
)
Eric has already told you the solution -- use MSYS, and build natively.
-mno-cygwin is a Cygwin kludge to make gcc and friends emulate a properly
named i586-pc-mingw32 cross tool chain, but it doesn't make configure
properly identify the *host* environment as mingw32; if you do not use
--host=i586-pc-mingw32, (or an acceptable alias), then the host will
still be identified as Cygwin, and, even though you've suppressed the
dependency on cygwin-1.dll, there is still a strong possibility that
your application will fail to deploy on a MinGW host.
Regards,
Keith.
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